5 Best Spirulina Supplements & Powders Reviewed with Dosage Recommendations

Pond scum.  It probably isn’t the first thing you’d think to add to your diet, but when that pond scum is spirulina, it is a veritable goldmine of nutrition.

Spirulina is a big craze right now among health-conscious consumers, and for good reason.  This blue-green algae has been harvested and consumed for centuries for its amazing health benefits. 

If you are new to spirulina, you might feel a bit overwhelmed. 

Should you buy spirulina or a different form of microalgae like chlorella?  Is spirulina safe for everyone?  What form should you take it in? 

In this article, I will answer all of your questions about spirulina so that you can shop confidently for the highest quality supplements. 

Let’s start by talking about what spirulina can do for you.

What Are the Benefits of a Spirulina Supplement?

Spirulina has numerous health benefits backed by scientific research.  Adding spirulina to your diet can provide the following advantages:

women drinking spirulina mix
  • Treat poisoning from heavy metals and other toxic supplements (1).
  • Supplement protein with a non-animal source (2).
  • Increase your intake of numerous nutrients including thiamin, riboflavin, niacin, folate, iron, pantothenic acid, magnesium, potassium, sodium, copper, manganese, and omega-3 fatty acids (2).
  • Treat your allergies using a natural antihistamine (3).
  • Treat body-wide inflammation, combating inflammatory conditions such as Alzheimer’s and heart disease (4).
  • Combat oxidative stress, slowing the effects of aging and preventing diseases which are tied to the damage of free radicals (5).
  • Protect the health of your brain, potentially reducing your chances of developing Parkinson’s, Alzheimer’s, or ischemic brain damage (6, 7).
  • Treat ADHD symptoms (8).
  • Reduce blood pressure (9).
  • Restore healthy cholesterol levels (10, 11).
  • Reduce triglycerides (12).
  • Prevent the oxidation of LDL cholesterol (13).
  • Potentially fight against oral cancer (14).
  • Increase endurance as well as isometric muscle strength during your workouts (15, 16).
  • Keep blood sugar levels stable and potentially reduce your risk for diabetes or even treat the disease (17, 18).
  • Chelate metals, potentially preventing liver damage (19).
  • Boost your satiety and lose weight more efficiently (20).
  • Spirulina can be used to produce gamma-linolenic acid (GLA), which in turn can be used to treat PMS, eczema, arthritis and more (21).
  • Fight candida infections (22).
  • Manage HIV/AIDS (23).
  • Possibly prevent skin tumors from UVB radiation (24).
  • Treat hepatitis C (25).
  • Reduce your risk of stroke (26).
  • Protect the health of your bones and reduce your chances of getting osteoporosis (27).
  • Protect yourself from radiation sickness (28).
  • Boost the power of your immune system (29).
  • Promote healthy intestinal flora (30).
  • Treat the inflammation and pain of arthritis (31).
  • Speed up the rate at which your wounds heal (32).

As you can see, that is quite an array of benefits.  Research is in the early stages for many of these, but right now there are more than a few reasons to be optimistic. 

Taking spirulina on a regular basis can protect your health now and in the future.

Want to learn more about these health benefits?  Be sure to read our in-depth article on the topic, 30 Health Benefits of Spirulina

KEY POINT: ​Scientific research shows that spirulina can benefit our bodies in many different ways.  

Protect your bones, improve markers for heart disease, bolster your immune system, and boost your health in numerous other respects by taking spirulina supplements.

Spirulina benefits infographic

Want to use this infographic on your blog? Just copy and paste the code below!

​Is Spirulina Safe?

Ground spirulina in green bowl

If you have been looking into spirulina supplements to take, you may have heard that spirulina is not always safe.  

There is some foundation to these claims, but it only applies to spirulina which has been harvested from contaminated waters.

Spirulina has many unique properties, one of which is the ability to absorb heavy metals, harmful bacteria, microcystins, and more (33).

This is actually quite cool, because in the right context, it can be useful.  Spirulina can be used as a natural water-purifier.

But obviously you do not want to be consuming spirulina which has absorbed toxins from its environment.

There are contaminated spirulina products on the market. The spirulina contained in these products usually has been harvested from the waters around Japan and China, which are contaminated by many pollutants.

There are serious consequences to consuming contaminated spirulina. To name just a few, you could experience nausea, vomiting, stomach pain, liver damage, excessive thirst, and rapid heartbeat.  

If the poisoning is severe enough, you could even die.

This should not discourage you from taking spirulina, because spirulina by itself is safe.

It is the contaminants present in some spirulina which are unsafe.  Spirulina which is harvested from pure waters is not exposed to these contaminants, and so remains pure itself.

Shopping from trusted brands ensures that you are getting spirulina which is pure and safe.

Quality brands harvest spirulina from clean waters.  They also subject their spirulina to extensive testing to make sure that it is toxin-free.

So long as you stick with these companies which follow these quality-control protocols, you can rest assured that you are getting the benefits of spirulina without exposing your body to toxins.

KEY POINT: ​Spirulina itself is perfectly safe if it has been processed appropriately.  

But some spirulina is contaminated by unsafe toxins, so make sure the spirulina you are buying is pure.

​Can Everyone Take Spirulina?

Most people can take spirulina without any concerns. 

These are the exceptions:

  • Patients with auto-immune diseases, for example lupus, MS, rheumatoid arthritis, or pemphigus vulgaris.
  • Those who have Phenylketonuria (PKU), a metabolic disorder.
  • Women who are pregnant or breastfeeding (unborn children and infants who have not yet been tested for PKU could be in danger if they do happen to have the disorder).

KEY POINT: ​Spirulina is safe for most users, but those who have auto-immune diseases, are pregnant or breastfeeding, or have PKU should not take it.

​Are There Spirulina Side Effects?

The majority of users report no side effects with spirulina. But if you take too much, it is possible to experience an upset stomach.  

You can avoid this if you take the appropriate dosage (which is already quite high, see below).

KEY POINT: ​If you take spirulina in the proper dosages, you should have no side effects.

​What is the Correct Dosage of Spirulina?

You can safely consume high amounts of spirulina. 

It is generally recommended that you take anywhere from 2,000-3,000 mg per day (33).  You usually do not take this all at once.  

Instead, you take 4-6 portions each day, each consisting of 500 mg. 

KEY POINT: ​It is recommended that you take 500 mg of spirulina 4-6 times daily.

​Types of Spirulina Supplements

spirulina powder and tablets on spoon

As with many other health supplements, spirulina comes in a few different forms. 

Here is what you may encounter while you are shopping online or at your local supplement store:

  • Capsules: Most spirulina supplements on the market take the form of capsules.  Each contains a measured dosage of powdered spirulina.  This is an easy and convenient way to get the right amount.
  • Powder: If you want complete control over your dosages, opt for spirulina powder.  This is the powder in its loose form.  You can mix it into recipes or juice drinks and take it that way.  Not only is this convenient, but it also makes it easy to augment your entire family’s spirulina intake.  Just add it to some of the meals you prepare (it goes well in soups, cereals and breads). 
  • Drink mix: This is essentially powdered spirulina again, but marketed as a drink mix. 
  • Foods or beverages: You might find foods or beverages in your grocery market which contain spirulina.  While they are not concentrated supplements, they are another option for boosting your spirulina. 

No form of spirulina is really ​"best.​"  It all depends on your individual needs.  Just pick whatever works for you.

KEY POINT: ​There are multiple forms of spirulina available.  You will probably purchase spirulina capsules or powder, but there are also drink mixes as well as foods and beverages enhanced with spirulina.

​What to Look For in a Quality Spirulina Supplement

How can you know whether you are getting high-quality spirulina which is ideal for your needs? 

Here are some features to look for:

The right dosage for your health needs.

If in doubt, capsules which are 500 mg are great for most purposes.  

Research spirulina studies for the condition that you wish to treat and check which dosages were demonstrated to be effective.  

This will help you decide on an exact dosage to take each day. 

The top dollar value.

This does not mean buying the cheapest bottle of spirulina on the market.  It means picking the best bang for your buck.  

Consider both the dosage amount and how many capsules are in a bottle in relation to the price, and calculate the true value from there. 

High bioavailability.  

This is something which is always useful to keep in mind when you are supplement shopping, but in general, spirulina is actually one of the more bioavailable types of algae you can buy.  

Indeed, it is easier for your body to digest than chlorella, which is why it tends to be a superior value (plus, it costs less).

A trustworthy brand.  

This is important with any supplement you are shopping for, but it is particularly vital when shopping for spirulina.  

This is part of what helps to ensure that the spirulina you are getting is pure and safe.

A brand with a strong reputation needs to defend that reputation, and that means continuing to product quality supplements.

spirulina on spoon and table

Harvested from clean water.  

If you can, try to find out where the spirulina in the supplement you are considering purchasing came from.  

If it was harvested from waters you know to be polluted, buy something else.  If it comes from fresh, clean water, that increases the odds that you are getting a safe product. 

Tested for purity.  

Research to see what kind of purity tests a supplement has undergone.  

They should preferably be conducted by a third party which has a strong reputation for objective, unbiased, comprehensive testing.

Easy to swallow.  

As with any other supplement you might shop for, you should try and choose a capsule you can swallow with ease.  

Remember, if you have a hard time with capsules in general, you can always get a drink mix or powder instead. 

No binders or fillers.  

Look for a supplement which is free of unnecessary additives, and just delivers pure, wholesome spirulina. 

Tolerable flavor.  

Some people hate the taste of spirulina.  

If that is you, a capsule is better than a loose powder (though you can disguise the powder flavor somewhat by mixing it into the right food or beverage).  

If you do go with a capsule, check to see if other reviewers report a taste or aftertaste with the product. 

KEY POINTFinding the right spirulina product means evaluating your needs and choosing a supplement which is safe, pure, affordable, and the right dosage.

​How to Take Spirulina Supplements

Taking spirulina is easy.  If you bought spirulina capsules, check the daily recommended dosage and then take the capsules as suggested with water

With a powder or drink mix, take about 1-2 teaspoons daily.  Stir it into a smoothie or juice drink, or cook it into your recipes. 

KEY POINT: ​Take the daily recommended serving of the spirulina supplement you have chosen to enjoy the full benefits.

​Spirulina Supplement Tips

  • ​Feel free to take high dosages of spirulina, but do not exceed the recommendation of 2,000-3,000 mg.
  • ​Shop from a brand which you can trust.
  • ​Always check to see where the spirulina came from, how it was processed, and whether it was tested and certified free of contaminants.

​Best Spirulina Supplements

​Now that you know all about spirulina supplements and how to shop for them, let’s take a look at some of the most popular and highly-rated ​spirulina supplements on the market today.

​Recommended Spirulina Capsules

Right now, this is one of the most popular spirulina products available on the market, as well as one of the most highly rated.  

As the name implies, it is grown and harvested in Kona, Hawaii by Nutrex Hawaii.  The company has been manufacturing the product since 1984.

  • 1,000 mg.
  • 180 count.
  • Vegan.
  • Non-GMO.
  • Pesticide and herbicide free.
  • Manufactured in a GMP certified facility.
  • Quality-tested.


  • ​Nutrex reports in its FAQs that each lot of spirulina is subjected to 15 different tests to look for heavy metals, microbes, and other contaminants.  Additionally, the spirulina is grown in controlled conditions.  As the pH level is maintained at close to 10, other organisms have a difficult time surviving.
  • ​According to customers, there is no noticeable taste or aftertaste to this supplement.
  • ​The company that manufactures this product has been in operation for a long time and has built a strong reputation.
  • ​The ingredients list is minimal and contains no unnecessary additives.


  • ​A few customers reported they felt nauseous from taking this supplement.  My guess is that they may have exceeded the proper dosage, as this effect is known to happen if you take too much spirulina from any brand.

What Pure Hawaiian Spirulina Is Best For

If you want a spirulina supplement which comes from a brand that is known especially for its spirulina products and has built a reputation around them, it is pretty hard to beat Pure Hawaiian Spirulina. 

If you are looking for yet another high quality spirulina supplement to try, a popular product to consider is BRI Nutrition Spirulina. 

  • 2,000 mg.
  • 120 count.
  • Manufactured in the United States in GMP-compliant facilities.
  • All spirulina is batch-tested.
  • There is a 60-day satisfaction guarantee.


  • ​This product was processed through natural means, not machinery.
  • ​​These are vegetarian capsules.  Only the most minimal ingredients have been used to create the capsules.  Everything else is just pure spirulina.
  • ​These capsules were created specifically to be as taste-free as possible for those who do not like the flavor of spirulina.


  • ​​There is not a lot in the way of negative feedback for these capsules.  A few people still complained about the taste or the smell, but most reported that they  were delightfully flavorless and had no noticeable odor.

What ​BRI Nutrition Spirulina Is Best For

​Despite a handful of complaints about taste, I would say that these capsules are an excellent choice if you want taste-free spirulina supplements.  

Again, the majority of customer reviews I have perused indicate the capsules have no strong flavor or odor, and they were manufactured with that key goal in mind. 

​Looking for Spirulina capsules from a brand which you may already be familiar with?  

NOW is a well-known company which manufactures a wide variety of herbal supplements.  

Their spirulina product is very popular. 

  • 500 mg.
  • 180 tablets.
  • Non-GMO.
  • Fully vegetarian.


  • ​​The only ingredient listed on this product is organic spirulina.  Being as these are pressed tablets rather than capsules, this may actually be accurate.
  • ​​There are no additives, and no common allergens or fillers such as wheat, gluten, soy, egg, milk, shellfish, corn, yeast, starch, salt, or sugar.
  • ​​NOW subjects their spirulina to testing to look for microbials, heavy metals, and other possible contaminants.
  • ​​This is a big-name brand.  There is a good chance you already have used supplements manufactured by them.  If you like NOW’s other supplements, you will probably like their spirulina too.


  • ​While this product is less expensive than many others, you need 6 tablets to get a whole serving.  That means that it is not necessarily as cheap an option as it initially appears.
  • ban
    ​Some people do not like tablets; they find them hard to swallow.  But so long as this is not an issue for you, it is not a drawback.

What ​NOW Spirulina Is Best For

​You should consider taking NOW Spirulina tablets if you want to shop from a brand which is highly reputable and which you may already be used to dealing with.  

These are also a good option if you are avoiding capsules because of the binders used to manufacture them. 

​Recommended Spirulina Powders

If you want to purchase loose spirulina powder instead of spirulina in capsule or tablet form, think about MAJU’s Spirulina Powder.  

This popular product is reasonably priced (the price range for spirulina powder can be quite wide), and is grown in the USA.

  • Grown and harvested in California.
  • Non-irradiated.
  • Non-GMO.
  • Pesticide-free.
  • 30-day satisfaction guarantee. 
  • Lab-tested.
  • Kosher.


  • ​​All spirulina manufactured by MAJU is tested for microcystins and is certified to be 100% free of contamination by them.
  • ​​Many spirulina manufacturers overseas irradiate their spirulina in order to kill pathogens.  MAJU takes other approaches to ensure that the spirulina they sell is contaminant-free.
  • ​​The majority of buyers said that this spirulina has a very "fresh" flavor.


  • ​​I did not spot any major drawbacks with this spirulina powder while I was researching.  I did find a few complaints about taste, but those were from users who probably do not like the taste of spirulina in general.

What ​MAJU Spirulina Powder Is Best For

​If you are trying to get away from irradiated spirulina from overseas, and prefer to stick with a USA-based company which uses alternative methods for manufacturing, MAJU Spirulina Powder is a great choice. 

Another non-irradiated spirulina powder product you can purchase is this one from Triquetra Health.  

It is raw, vegan and organic, and has been extensively tested to ensure quality and safety.

  • 4 organic certifications: USDA organic, Naturland, OCIA, and Ecocert.
  • USP-verified.
  • Halal certified.
  • Approved under California Proposition 65.
  • Non-irradiated.
  • Free of contaminants.


  • ​This company produces spirulina which is 100% free not only of heavy metals and microcystins, but also of mold, yeast, e-coli, pheophorbides, and other contaminants.  In fact, the third-party testing looks for more than 130 different kinds of toxins.  That is incredibly rigorous testing.
  • ​Contains no solvents, binders or fillers.
  • ​​Free of soy and gelatin.
  • ​​Non-GMO.
  • ​This spirulina is never irradiated or chemically treated.


  • ​The spirulina is sourced from Southern India, so if you are looking for something USA-based, this isn’t it.
  • ban
    ​Some people said they didn’t like the taste.  My guess however is that they would not like the taste of any spirulina product.  That really does not say anything negative about this one.  Spirulina tastes pretty pungent.  That is just something you have to accept if you choose to buy it in powdered form.

What ​Organic Spirulina Powder from Triquetra Health Is Best For

​This is another good product to think about buying if you want non-irradiated spirulina.  I would also suggest considering this one if you want spirulina powder which has received rigorous third party testing. 


High-Quality Spirulina Is a Safe and Powerful Supplement With a Wide Range of Health Benefits

Not all spirulina supplements are of the same quality.  Inferior products not only will deprive you of the full nutritional benefits of spirulina, but may also poison you. 

For that reason, it is vital that you shop only for high-quality spirulina supplements from trustworthy brands. 

While any of the 5 products I have recommended would be excellent choices, I would say that overall the best loose powder is probably Organic Spirulina Powder from Triquetra Health, and the best capsule product is Pure Hawaiian Spirulina

These products are pure spirulina, loaded with nutrition and free of toxicity.  They will boost your health now and protect you from an array of diseases, helping to maximize your well-being in the future.

1 Star2 Stars3 Stars4 Stars5 Stars (13 votes, average: 4.23 out of 5)


If you found this article helpful, follow us on facebook and/or share the article with buttons below so other people can benefit from it too:

Facebook By Weblizar Powered By Weblizar

You can republish this article on your blog/website by complying with the following republishing guidelines.

  • Updated August 27, 2018

Leave a Reply

3 Comment threads
1 Thread replies
Most reacted comment
Hottest comment thread
4 Comment authors
newest oldest most voted
Notify of

Thank you so much for this article. I have just started doing research before purchasing, and this article was most informative. Much appreciated 🙂 Tha is again!

Spirulina has the number of benefits that’s why it is also called the super food of the 21 st century. Organic Spirulina is the complete package of vitamins and nutrient. It helps to detoxify the body, control sugar level, fight against cancer, make a stronger immune system and many more…
Thanks for giving the information about various spirulina benefits keep updating..


No mention of “Australian Spirulina”. Any reason/s?

Malcare WordPress Security

Send this to a friend